Four workers were killed, and six others were injured when part of a highway bridge under construction collapsed in South Korea on Tuesday morning, officials said.

       By the afternoon, all 10 workers who were at the site were accounted for, South Korea’s National Fire Agency said, after emergency crews had searched through the rubble for victims.

       The collapse happened about 9:50 a.m. local time near the city of Cheonan, which is about 50 miles south of Seoul, the capital.

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